Accessing Soil Pipe Stack for Extension

I have just built an extension and have built an en-suite next to existing bathroom.

Basically I need to tap into the soil pipe, but this can only be done as far as I can see by taking out around 10 bricks of existing wall and then take the breeze blocks out to get to the soil pipe which runs down the inside of the corner of the house.

I would then have to T-this off if I can and do it like this.

Does anyone have any easier suggestions, cos this is a nightmare job!
I would have gone through bathroom back out, but this has been all tiled last year and would create a lot of work.

You can't make an omelette without cracking an egg.
You will have to meet the soil pipe somehow. Ask a plumber round for advice.

Bahco said:

You can't make an omelette without cracking an egg.
You will have to meet the soil pipe somehow. Ask a plumber round for advice.

Click to expand...

but don`t expect it free like this